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使用ActionBar实现Tab导航

为了使用ActionBar实现Tab导航,按如下步骤进行即可。

1.调用ActionBar的setNavigationMode(ActionBar.NAVIGATION_MODE_TABS)方法设置使用Tab导航方式。

2.调用ActionBar的addTab方法添加多个Tab标签,并为每个Tab标签添加事件监听。

Fragment相当于activity片段,通常使用单独的activity组合多个fragment,这样既可以在一个activity创建多个用户界面,又可以让多个activity复用同一个fragment,总之,fragment相当于activity的模块化区域。

fragment有自己的生命周期,可以接受处理属于它自身的事件,并允许activity运行期间动态的添加删除fragment。

fragment允许定义自己的布局,也可以通过生命周期回调方法定义自己的行为,这一点非常像activity。

实例的布局文件:

StandardWidget\res\layout\tabnavigation.xml

 1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3     android:layout_width="match_parent" 4     android:layout_height="match_parent" 5     android:orientation="vertical"  6     android:id="@+id/container" 7      8     > 9     10 11 </LinearLayout>

activity代码:

  1 package com.example.standardwidget;  2   3   4 import android.os.Bundle;  5 import android.support.v4.app.Fragment;  6 import android.support.v4.app.FragmentTransaction;  7 import android.support.v7.app.ActionBar;  8 import android.support.v7.app.ActionBar.TabListener;  9 import android.support.v7.app.ActionBarActivity; 10 import android.support.v7.app.ActionBar.Tab; 11 import android.view.Menu; 12 import android.view.MenuInflater; 13 import android.view.MenuItem; 14 import android.widget.Toast; 15  16 public class MyActionBarActivity extends ActionBarActivity implements 17         TabListener { 18  19     private static final String SELECTED_ITEM = "selected_item"; 20  21     @Override 22     protected void onCreate(Bundle savedInstanceState) { 23         // TODO Auto-generated method stub 24  25         super.onCreate(savedInstanceState); 26         getSupportActionBar().setDisplayHomeAsUpEnabled(true); 27         setContentView(R.layout.tabnavigation); 28         // 设置是否显示app的图标 29         getSupportActionBar().setDisplayShowHomeEnabled(true); 30         // 设置是否将app图标转变成成可点击的按钮 31         getSupportActionBar().setHomeButtonEnabled(true); 32  33         getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); 34         getSupportActionBar().addTab( 35                 getSupportActionBar().newTab().setText("第一页") 36                         .setTabListener(this)); 37  38         getSupportActionBar().addTab( 39                 getSupportActionBar().newTab().setText("第二页") 40                         .setTabListener(this)); 41  42         getSupportActionBar().addTab( 43                 getSupportActionBar().newTab().setIcon(R.drawable.p13) 44                         .setText("第三页").setTabListener(this)); 45          46          47     } 48  49     @Override 50     protected void onRestoreInstanceState(Bundle savedInstanceState) { 51         // TODO Auto-generated method stub 52         super.onRestoreInstanceState(savedInstanceState); 53          54         if (savedInstanceState.containsKey(SELECTED_ITEM)) { 55         //选中前面保存的索引对应的fragment页 56             getSupportActionBar().setSelectedNavigationItem( 57                     savedInstanceState.getInt(SELECTED_ITEM)); 58         } 59  60     } 61  62     @Override 63     protected void onSaveInstanceState(Bundle outState) { 64         // TODO Auto-generated method stub 65         super.onSaveInstanceState(outState); 66         //将当前选中的fragment页的索引保存到bundle中 67         outState.putInt(SELECTED_ITEM, getSupportActionBar() 68                 .getSelectedNavigationIndex()); 69     } 70  71     @Override 72     public boolean onCreateOptionsMenu(Menu menu) { 73         // TODO Auto-generated method stub 74         // 为ActionBar扩展菜单项 75         MenuInflater inflater = getMenuInflater(); 76         inflater.inflate(R.menu.main_activity_actions, menu); 77         return super.onCreateOptionsMenu(menu); 78  79     } 80  81     @Override 82     public boolean onOptionsItemSelected(MenuItem item) { 83         // TODO Auto-generated method stub 84         // 处理动作按钮的点击事件 85         switch (item.getItemId()) { 86         case R.id.action_search: 87             Toast.makeText(this, "openSearch", 2000).show(); 88             return true; 89         case R.id.action_settings: 90  91             Toast.makeText(this, "openSettings", 2000).show(); 92             return true; 93  94         case android.R.id.home: 95             Toast.makeText(this, "App Icon", 2000).show(); 96             return true; 97         default: 98             return super.onOptionsItemSelected(item); 99         }100     }101 102     @Override103     public void onTabReselected(Tab arg0, FragmentTransaction arg1) {104         // TODO Auto-generated method stub105 106     }107 108     @Override109     public void onTabSelected(Tab arg0, FragmentTransaction arg1) {110         // TODO Auto-generated method stub111         Fragment fragment = new DummyFragment();112         //用于向fragment传入参数113         Bundle argsBundle = new Bundle();114         argsBundle.putInt(DummyFragment.ARG_SELECTION_NUMBER, arg0.getPosition()+1);115         //向fragment传入参数116         fragment.setArguments(argsBundle);117         //获取fragmenttransaction对象118         FragmentTransaction fTransaction = getSupportFragmentManager().beginTransaction();119         //使用fragment代替该activity中的container组件120         fTransaction.replace(R.id.container, fragment);121         fTransaction.commit();122     }123 124     @Override125     public void onTabUnselected(Tab arg0, FragmentTransaction arg1) {126         // TODO Auto-generated method stub127 128     }129     130     131 132 }

fragment代码:

 1 package com.example.standardwidget; 2  3 import android.os.Bundle; 4 import android.support.v4.app.Fragment; 5 import android.view.Gravity; 6 import android.view.LayoutInflater; 7 import android.view.View; 8 import android.view.ViewGroup; 9 import android.widget.TextView;10 11 public class DummyFragment extends Fragment {12     13     protected static final String ARG_SELECTION_NUMBER ="selection_number";14     //该方法的返回值就是该fragment显示的view组件15     @Override16     public View onCreateView(LayoutInflater inflater, ViewGroup container,17             Bundle savedInstanceState) {18         // TODO Auto-generated method stub19         TextView textView = new TextView(getActivity());20         textView.setGravity(Gravity.START);21         //获取创建该fragment时传入的参数bundle22         Bundle args = getArguments();23         //设置TextView显示的文本24         textView.setText(args.getInt(ARG_SELECTION_NUMBER)+"");25         textView.setTextSize(30);26         27         28         return textView;29     }30 }

运行该实例,效果如图:

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使用ActionBar实现Tab导航